Mold for cement construction-blocks.



PATENTED JAN. 16, 1906.

M. M. ROBERTSON.

EMENT CONSTRUCTION B APPLICATION FILED AUG. 10, 1905.

LOOKS.

MOLD FOR G fies XXXW ylz r 3:1-

UNITED STATES PATENT oFFroE.

MALVA M. ROBERTSON, OF DES MOINES, IOVVA'.

MOLD FOR CEMENT CONSTRUCTION-BLOCKS- A li ati fil d August 10, 1905.Serial No. 273,567.

To all whom it may concern:

Be it known that I, MALVA M. ROBERTSON, a citizen of the United States,residing in Des Moines, county of Polk, and State of Iowa, have inventeda new and useful Improvement in Molds for Cement Construction- Blocks,of which the following is a specification.

The object of my invention is to provide a mold adapted to receivecement or other plastic substance while in a soft or semiliquidcondition and to mold the same into construction-blocks containingvertical channels.

Another object is to construct such a mold provided with two transversecores designed to form the channels in the block, said cores beingcollapsible and adapted to be entirely removed from the mold througheither longitudinal side thereof.

A further object is to construct said molds in a series, said serieshaving their bases and longitudinal sides in common.

A further object is to provide a mold adapted to receive and to forminto blocks a plastic substance mixed in a soft or semiliquid condition.

My invention consists of certain details of construction hereinafter setforth, pointed out in my claim, and illustrated in the accompanyingdrawings, in which Figure I shows a perspective view of one of the moldsand a portion of the second mold in the series, one end of .one of themolds and one of the common sides of the molds being shown in a positionremoved from the body. Fig. II shows a longitudinal sectional view ofone mold and a portion of the second, and Fig. III shows a transversesectional view of one of the molds.

Referring to the accompanying drawings, the reference-numeral is used toindicate the common bottom which I employ for the molds, and thenumerals 11 and 12 indicate the common sides I employ, said sides beingprovided with vertical companion channels on their inner surfaces at 13and 14., respectively, said channels being designed to receive endpieces 15 and 16, respectively, said end pieces forming the two ends ofeach of the longitudinal molds of the series. Mounted centrally andextending longitudinally upon the inner surfaces of the end pieces 15and 16 are wooden blocks 17 and 18, respectively, designed for purposeshereinafter set forth. Between the end piece 16 of one mold and the endpiece 15 of the next mold Specification of Letters Patent.

Patented Jan. 16, 1906.

in the series I have provided a space for purposes which will behereinafter set forth, and located centrally in said space and extendingthrough an orifice from the outer portion of side 1.] and through anorifice in the side 12 to the outer portion thereof is a bolt 19, saidbolt being provided for purposes hereinafter set forth. The numeral 20indicates a like bolt, said bolt being located immediately outside ofthe end 15 on the end of the series of molds.

In each of the longitudinal sides 11 and 12,

between the confines of the ends 15 and 16, I have provided tworectangular openings of equal size, 21 and22, said openings beinglocated centrally between the upper and lower edge surfaces and beingevenly spaced and arranged between the ends 15 and 16.

The numeral 23 indicates the face-plate I employ, said face-plate beingconstructed, preferably, of metal and being of sufficient dimensions tofit within the four walls of the mold and is designed to rest upon thebase, the face being uppermost.

Extending transversely across the mold from the opening 21 in thelongitudinal side 11 to the opening 21 in the longitudinal side 12 is acore composed of a base 24, designed to rest upon the surface formingthe base of the openings described, said base being of the same width asthe said openings, two side pieces 25 and 26, said side pieces extendingon eitherside of the base from the base to the upper surface of the saidopenings 21, a top 27, designed to fit between the sides 25 and 26 andto rest against the upper surfaces of the said openings 21, said topbeing held in position by two blocks 28 and 29, said blocks fittingbetween the base 24 and the top 27 on either'side of the said core andbeing of sufficient size to hold the top 27 securely in place againstthe upper surfaces of the openings 21. Extending transversely across-theupper surface of the base 24 of said core I have secured two cleats and31, said cleats having their ends beveled and being of sufficient lengthto rest against the inner surfaces of the two side pieces 25 and 26.Extending between the opening 22. in the longidinal side 11 and theopening 22 in the longitudinal side 12 I have provided another coreexactly similar in every respect and designed for the same purposes asthe core just described.

In joining the parts of my device the longitudinal sides 11 and 12 areplaced upon the upper surface of the base 10, the connectingbolts 19 and20 holding the same in position thereon. The end pieces 15 and 16 arethen placed in their respective positions by means of the channels 13and 14,1espectively. The face-plate 23 is then placed in position withinthe four sides of and upon the upper surface of the base of the mold.The base 24 of the core is then pushed through the opening 21 in one ofthe sides until its edge rests upon the upper surface of the base of thecompan ion opening 21 in the other side. The side pieces 25 and 26 ofthe core are then placed in position upon the upper surface of the base24, said side pieces obviously resting against the respective sidesurfaces of the openings 21. The top 27 is then placed in positionbetween the side pieces 25 and 26, and the blocks 28 and 29 are theninserted between the said top 27 and the base 24.

In practical operation the parts of the molds being joined the plasticsubstance to be molded is mixed to a soft or semiliquid condition and isthen poured into the mold until it completely fills the same. All of themolds in the series are likewise filled with the plastic substance and atop 32, designed to cover allthe molds in the series, is then placed inposition covering the said molds. The plastic substance thus placed inthe molds is allowed to remain therein for a sufficient length of timeto cause it to become completely hardened. In removing the blocks thushardened from the molds the top 32 is first removed and then the blocks28 and 29 in each core of each of the molds in the series and are thenremoved through the same opening. The base 24 is then forced upwardlyfrom the hardened plastic substance and is likewise removed through theside opening. The connecting-bolts 19 and 20 are then loosened andremoved, thus obviously removing all support for the longitudinal sides11 and 12, which are then removed. The end ieces 15 and 16 are thenforced backward y within the space which was by construction leftbetween the said end pieces until the cleats 17 and 18, respectively,are removed from their respective recesses, said end pieces being thenremoved. These operations having been gone through, the hardenedconstruction-block mold as described is left resting solely upon theface-plate, from which it is removed at Will by the operator. The partsof the device are then again connected and the molds are then ready toreceive the plastic substance for other blocks.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is-

In molds for forming construction-blocks containing air-channels, corescomprising a base having on its'upper surface two transverse cleatshaving their ends beveled said base engaging the companion openings inthe longitudinal side of the mold; side pieces mounted upon the uppersurface of the base of the core and engaging the sides of the openingsin the longitudinal sides; a top extending between the side pieces ofthe core and engaging the upper surfaces of the opening in thelongitudinal sides; two blocks mounted between the base and top of thecore designed as a support for the top substantially as shown anddescribed.

MALVA M. ROBERTSON. Witnesses:

O. O. CARTER, BLANCHE SEDGwIoK.

